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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cda094858a3a47c11284b879108b491c46befac239747b4bc19d81ad8a4b7c' 
  AND token = 'WvcllklFF0IrBx/YOmUhCauxn0RRr+qmzhFmuNus1qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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