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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c4f8c138ed53cf18f6a1cb3a014aff125ffd7cba4c15cddd3b8a5507e49e29' 
  AND token = '7NDuxcw04uTctf4IssC2mqA2eECaGnty0XfE7UAB7rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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