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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a522a70c08bba2dfb2c2e82c332f002650b477915402898d80497f2aa696b0' 
  AND token = 'xjCHryCazZcpntxTxMdMMtT/yLFKYO3eGFIj1GlyEU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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