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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71759061e6238f22183552997fb5d5af607903a8a6c30b2570e1f7cd0e847d70' 
  AND token = 'pVO2N+Z1U8k9id3mta2pcBTljLeM1u/ljknL7IXB8tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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