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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d7bd8e6c984b61a216d531f5ad69e0f53b4b0bc71053a51eac1d757e192953' 
  AND token = 'IDSbpeuer662B6syN035W1QJ8iUzoLFktxiIFjDXVME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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