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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e039bf134eb808cf9e679dbe58a69dbd9ec841437bb603da6d0b1d4fedda012e' 
  AND token = 'SXGBIrbv2xuuBLnXFSAfOGqMuIjTgGnE2bl/A+nO25I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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