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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01217e747de9f7247f6d99565a85c60bc14ba6c68a0b0977205666a89effd8fe' 
  AND token = 'nEsFr6KMsxZbEqR8ISTZ3TthhRQy3QzdX25t5E2Vf0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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