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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e417091c12459cc45899c4448e0adedc6b0910d24e48faca720f3320a3c9b1cf' 
  AND token = '3sBKeVWKTDZ5e4CfMyPjpD6txeV0vzExI482Y6fSos0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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