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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e02de96814d99cb21fcab89bc2dec7cfb7b09a6a63fe31a097b7217fa6b335' 
  AND token = 'b6lyTlgDVziu3C2jQIIcSyA20RsnZ2L+GRRxvOdCGiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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