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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd83f9944d90df678a195febb79fee62b34e39847725f4f7429cb9c19cc7d87' 
  AND token = '7L9mKwuM1eqE+x4AETcuSUiK5QeUKRaMfyHwsgvgXG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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