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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee9bdc1f5bcbe9a2a687f1f2c1689fffcdd00399801b312d3ea321392cd4e96' 
  AND token = '3Xe2cgIOJIR5SY7U5ecpUqkiCEcp/R7Gh9fG2gWWRlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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