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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469ba6bceca7254b3ae563b28bc0759b403aa0665df668189b30fac7673b11c0' 
  AND token = 'KjXGLoqkQyxDr08Ec+WlDu8+GpGp6HnpjiQr1LFmOUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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