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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd895437eef7d4526135f9742cf825481d130c6ab15b92c1f1d49e9805dfad507' 
  AND token = 'tjwNKXH2xgIWT71+783CrZ5oDnt92+q1+8WT+UH/X7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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