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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a547ad9ec86f8a0aba99e54c41cd9233054514e185c10fbc6146a05570081af' 
  AND token = 'mzlvtdG4ZL0fp9mPWAtfqog4BJmo9DHV0jtngrgKAYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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