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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b59244c439e361c926ed3e6f4e1be3c8a37c367174eac015cdf212383be507e' 
  AND token = 'HtWEKBPoM94gnSdIRaFYpp8Ae0nneBB5EoiXOWNC1EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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