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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b62dee719e4b6ab2ac131ba856f62bf5adde80e741a21040a7b976ada507c0' 
  AND token = 'okHONHRYdePEzNksUSi9vNE5mTiXKg92Q95ejn9ulO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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