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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44abce81af637ebc96fc4f2d48af55765a666a99d7bc5d4a266236e3a0f542af' 
  AND token = 'ELciNTyUVbFN4CNieD9Gozqz/BQp0aJb4LXfB56kneI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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