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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c3dc8a4013c373eb5743fe4ef4e4130a2c3e396b16ca3554052b5e090e0e5c' 
  AND token = 'Eg06m742jIRlGTEijh1tjb7xPE835SACD0J+drQ6qlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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