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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf99c2b9e091f7971b5d12c6715d948c1516b3244f7756c0b31dc9028956378' 
  AND token = 'dyfcBvPrfu4ImTSPujc1hvS2y96kA35A+cBb1Ua+csc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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