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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8e8f44778c671c1bda0059ae5dc2ba64101f71f8ac5c6a09389b38f62431e2' 
  AND token = '1BZPKbGtqyZ9vFdr4QHSdmUWaSNdZRrd8SVuxHMgp+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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