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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8ee563413c0c0776c7825ca049fb453b0d6b6652504ea90ec0b8c0b986014d' 
  AND token = 'Y/ycLIN9C9lRAXTSOml4eQz152Tx8owxfeHh0M3MVb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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