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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820c7523cac16caadd4e32c08935938cff3f455bb37b5281483eb2a4587ceac7' 
  AND token = 'y5t9+3FU6xpmg4uSlZq69KRJaIMzPGpvpQKdgyDqJec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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