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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c985644e90017cc0b180396db6e3d3264e0928a13dcd9f1f315e0ad6a33f90' 
  AND token = 'nZX4uTqdrgcJdwuqgI6Oz7UZIbxPK0dp9tO9n0xnKjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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