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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38083f8e7d38cdcc959c36aa06b2ac3c8265f8631ce4c2d4eced69d221526d51' 
  AND token = 't+t4HdG5BsZ4A7mg5pl14VwuQZNUJfCLkfkGpS3Pf1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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