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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87804bd5210bbccfe19db53c3cd703c940dd2560c1148551c9f74ed31ce1c844' 
  AND token = 'y4mFhIYbZLB1x7z2CdCQViEAnqCPGqzuSU0tPu/F3d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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