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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac2592c83bfcd9fb0a8911712166dae9475896821fc878854fe7cb2fc517dcb' 
  AND token = '3qRCpPajqc43Pz1oBIPgN0Q9onigAtA/xAQlEN8RtdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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