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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fbaba89dbfefc91d028924400eb0c11877d62bd7c1b26699c34fc598415799' 
  AND token = 'qnr0re9+L7GKq2apzOF+JLMyh0zpRTSJwxrwau806tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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