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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3bf37df4f18cd98f2b0d88e71f5b2a1ddd3a0afd3074fd5f0eb0d026d90c3f' 
  AND token = 'Z2Nldpamo1qKIyt4g1h9ba5BZhVCAmstKLyHxbl3irk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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