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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b7bf963abbf7ad4b58dd3f0136ee3b0859f78b0063208a5e784a9a077ae3cf' 
  AND token = 'T1iaxu2P9M0L6+lK6Af8VTrFzJk3fxji7mo7ZDDp1io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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