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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6537698a2a41921d2a7f73bd5d13ef0fe6df3f16da86b945cfb2e2baed98c603' 
  AND token = 'SD8fPCmwP43s9nloRsnMqmQ/6HnxNX9BjR5yzZzIqfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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