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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadabec809d88c8f8cfe1843424200c47c41512be3fef27b7789d352e4499038' 
  AND token = '9qTLSbeI80LDfnfINTqwkzDUq5kGa3x2k9CKJETcIWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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