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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36027bf277d77c0b1d783a13e778c0045964bfbec496dc86898790c4cc54c93a' 
  AND token = 'fuGjrxFBMVHLAHkJt8B5CIqVyFNSgPv00yrHLMhCw7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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