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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b891c1c36bdd5b4f7bb142ed6ce51d1f42f5a0428ce582eebad5a4214ec48a' 
  AND token = '2IW3eZ1H8Gjfn/JRwccyqmnO6mCB93hoJeNlNEXVr6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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