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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7784e1e9fb2fc15a919513ea75be96964b695a49bfb0ed6398a3f53e40d810b3' 
  AND token = 'rfTG5MzyVi/mfWCj66PU/ss4+arQ+sB0DAV03d66Khk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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