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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a46902de0c8403ed9c774a5150a7c0446bd9478769c82a0a136d2851ec9d5c5' 
  AND token = '6Yl4dhDNWKeC1mbpsZpbWtmxm3mbojHTje5JKBP4g8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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