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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2404f55c873af4011b3b2bff5600b66d86361a24d12191e79cf98123312145' 
  AND token = 'aYBvA/yG6gcUDNaQnX9w6fv04mKMtN4w7/HtkBcXdGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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