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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5345a00c8b97873768c1f37e9aec269cea41b1f329d6f917f14a7912bafc9a6' 
  AND token = 'sY/h7exeiOYkd07u4L1CFGA5bZap2mShJ6t04nyf+qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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