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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97052b0cd39735b9787d0aa20196758077c14adeb8b916e7f47260f3f68b4f4' 
  AND token = 'LRTdyzC1ZW9dduNceG1U28Lj1RYUoTEXChIM8uQyLuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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