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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7648891fc18814a5300ab502d27b0f91f714c0619a9547321107d1f57e7a616b' 
  AND token = 'G5bl3sfLpZxNVHk+69ZkKN0TuUIJUfQNBXM/IpnwD2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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