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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b085e5625448f727180f1bd7492a0966b86b119f10fc6cd20747fcc64bebbc06' 
  AND token = '4DeL/XiF52nT7BQRqbTlBUEcP/um7rv1N3ERkRka1y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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