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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e97dc3cb7314250c88887fac94bba72a93d06ac9c47fc667538e25867b4d106' 
  AND token = 'hc2iXTfpspuh//bDAwCawMmIyeCkEhsLbGIo8fyh8sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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