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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5122db652cc3f352c10f23f2894c24e8870c599f40c4fca8f195e02c30871582' 
  AND token = '0qh0kgxc6bjfFLfYujj1eeuyWJZbjveNFKQzm5N1DeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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