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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a82c8ee44475c03249f3cb831b525c85ac0e4e601752cd52e60716744ce3fa' 
  AND token = 'RNKhl5JgD2TawPkgaD/06dQxAjwQbxKqMtns1lSF8nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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