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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb5708dd00a2b75a75f0fbe1e48ffad0042865165ca9b85b8a236892f49e7dc' 
  AND token = 'g/zWAkAVTMSn//H1e6Eb2YDys68TRrqOQo7Ig3QKFeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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