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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e2ef46352a2f39b29345945dc4998d731e16dd8d0aae0f5518f7397d973fb3' 
  AND token = 'nBLW7Xirj42dpWlr8orfX+9DOHLT9Z24946jY+tJI3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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