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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088186ffa4b01dd076c7ede063a86bdeb7b49e27ceb8680e2542e23a539554f4' 
  AND token = 'l7VbJl3EfSvfSR6AvfEq4CckDMFeVFsiwSTB0yX8dbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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