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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7167d4a236a3ef4d391a2b56a01bc8a0d078e62c74d93ed8b857963201fed067' 
  AND token = 'cGjl0tab7fCWc2gL2f9fCkyekKpU4wekJqy5Vqazjy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}