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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5892d8bf36533919ce07c74b8eb3a50a466911c1e7cf58a7a0c8b8c6aa4b1abb' 
  AND token = 'yQ5ycboI402jEItw8U4Gm9nyFV/cDQf+a49U85AiA0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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