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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdfb24dd562190905c564884db32c6189520d48ca63f28df11792cbd181fef9' 
  AND token = 'SzBRYVGL0y4wEDtrzgNUEXyl/CZxMdF1H1qBbCLuE74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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